package com.firesafe.user.utils;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.firesafe.common.entity.UserEntity;
import com.firesafe.user.dao.UserDao;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;

@Component
public class TokenUtils {
    private static UserDao staticUserMapper;

    @Resource
    private UserDao userMapper;

    @PostConstruct
    public void setUserService(){
        staticUserMapper=userMapper;
    }

    //生成token
    public static String createToken(String userId,String sign){
        return JWT.create().withAudience(userId)  //将userId保存到token里面，作为载荷
                .withExpiresAt(DateUtil.offsetHour(new Date(),2))  //2小时后token过期
                .sign(Algorithm.HMAC256(sign));  //以password作为token的密钥
    }

    //获取当前登录的用户信息
    public static UserEntity getCurrentUser(){
        try {
            HttpServletRequest request=((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            String token=request.getHeader("token");
            if(StrUtil.isBlank(token)){
                String userId=JWT.decode(token).getAudience().get(0);
                return staticUserMapper.selectById(Integer.valueOf(userId));
            }
        }catch (Exception e){
            return null;
        }
        return null;
    }
}
